Kevin Dragnet

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These are questions asked by Kevin Dragnet

Hi! 2 questions

1. I notice that the Curl operator of the VectorCalculus package can't compute the Divergence of a 2D vector field. Of course the most classical case is 3D, but it can also be defined for 2D. Is there any way in Maple to compute the Curl of a 2D vector field using the Curl command?

2. How one can extract the components of a VectorField ? I tried op, GetComponents (LieVectoFields package) etc... but I didn't find a simple answer on the help pages. 

e.g. V1 := VectorField(<-x, -y>, cartesian[x, y])

I want to get {-x,-y}

Many thanks !

Dear all, 

I am trying to use another notation for the inert differential operators in the Physics package (using alias), I am not getting the correct result. Does anyone know how I can solve this issue? Many thanks!


Dear all, do you know if there is a way to ask Maple and the Physics package to use the bold notation of vectors instead of using arrows? 

Thanks, Kevin

Hi all !

I have a list of coupled ordinary differential equations 

L := [e1,e2,e3] = [diff(z(t), t, t)*m = 0, diff(x(t), t, t)*m - B*diff(y(t), t)*q = 0, diff(y(t), t, t)*m + B*diff(x(t), t)*q = 0] with unknown functions x(t),y(t),z(t).

I want to obtain the list of "normal forms" of the ode using the DEnormal function. The help page says that it is possible to use it with an operator list but none example is given. 



Dear all, 

I am trying to use the Physics package to perform a simple computation about the expression of speed and acceleration in the local polar basis (Frenet). I am trying to get something like :

Define the position vector :

differentiate wrt t to get the velocity vector 



Similarly :



Can anyone please help me ? Many thanks!

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